/*******************************************************************************
 * Copyright 2009 Time Space Map, LLC
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package org.tsm.concharto.web.util;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang.StringUtils;

/**
 * Utility for dealing with event catalogs (e.g. history, fishing, ...)
 * @author frank
 *
 */
public class CatalogUtil {

	public static final String HOST_HISTORY = "history";
	public static final String CATALOG_WWW = "www";

	/**
	 * Get the host part of the server name.  This is our catalog.
	 * If it is www, then that means history.
	 * 
	 * @param request
	 * @return
	 */
	public static String getCatalog(HttpServletRequest request) {
		String host = request.getServerName();
		String catalog = StringUtils.substringBefore(host, ".");
		if (HOST_HISTORY.equals(catalog)) {
			catalog = CATALOG_WWW;
		}
		if (catalog != null) {
			return catalog.toLowerCase();
		} else {
			throw new NoCatalogException("no catalog found in the request object (check the hostname)");
		}
	}
	
}
